The first one is PhpStorm's own simple built-in web server which IDE uses by default when you choose to open file in browser and alike from IDE and when you do not specify your own URL.
In order to use it you need to have local PHP Interpreter defined (as it needs actual PHP to process your .php
files).
In general the URL is: localhost:63342/YOUR_PROJECT_NAME/path/to/file.php
.
You can read a bit more about it here.
The second one is your actual XAMPP -- it uses default & standard for http protocol port 80.
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